feat: per directory history

[rawkode]

• Adds F3 as a switcher from Global to Current Directory
• MCFLY_RESULTS_FILTER env can be GLOBAL or CURRENT_DIRECTORY

[rawkode]

Fixes #267

[cantino]

This needs a rebase.

[cantino]

@rawkode Sorry that this dragged out. Want me to make that one change and merge it?